4qd 4QD Series Manuel d'instruction - Page 12

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Speed control pot

is essentially the same whether you use joystick or

single ended mode. A 10K pot is suggested, but you

can use any value from 1K to 22K. Higher pot values

will cause the pot fault detection to operate.

Speed control wiring of both modes are shown in the

diagram.

Top Speed adjustment

This is an optional addition. Either use a switch and a

fixed resistor or use a pot in series with the wiper of

the main speed pot.

A resistor (or a pot) of 62K will halve the top speed.

A 200K pot would give a 3:1 top speed range. The

diagram shows both the pot and the switch plus

resistor but only one should be used.

Alternatively if it better suits the wiring, a resistor

may be inserted in series with the top end of the pot.

10K with a 10K pot would halve the speed. Be

careful not to exceed about 30K pot plus series

resistor or the pot fault circuit may cut in.

High Pot Lockout

The controller is fitted with a protection mechanism

which disables it at switch on if the throttle pot is not

at zero speed.

This safety feature is integral with the controller.

Battery meter

If a battery condition meter is required it can

conveniently be connected to the 4 way connector.

Voltage Control

All of the inputs on the 4QD controllers are voltage

controlled.

Speed is controlled by the voltage (0-3v minimum)

on pin E of the 6 way connector. However when

using a voltage you must fit a 10K resistor in place

of the pot between pins D and F or the 'pot fault

detector' circuit will engage. This will disable the

Joystick (wig-wag) mode and Input

deadband

Factory default positions of the headers are shown on

the features diagram. Mode and deadband interact if

low dead-band is engaged.

Page 12

Reverse

Forward

Joystick mode

Maximum speed

Pot

Speed control

However it can be disabled by bridging out the link

point marked HPLO. Also, the 'Inhibit input' forces

the internal 'Demand Speed' (which is sensed by the

HPLO function) to go to zero, disengaging the

HPLO so the controller will always start when the

Inhibit is removed.

Meter + is internally connected to the 'ignition' line -

which is the battery positive, switched by the ignition

switch so the meter is off when the ignition is off.

Meter – is internally connected to battery –.

pot fault feature.

This enables two controllers to be fed of the same

pot: the common speed pot is connected normally to

one controller and pins E on both controllers are

joined.

Ignition pins can be joined, as can reverse pins.

As supplied, the controller is set up for 'single-ended'

mode (speed and separate reverse switch) and high

dead-band.

Mode is changed by moving the 'header' J1.

4QD series controller instructions.

Switch

C B